Improvement in stamping dental plates



f4 Sheets-Sheet 1.

` `c. F. BARNARD. Y STAMPING DENTAL PLATES.' 4 'No/186,522. Patented Jan. 23, 1877.

4 sheets-Sheng( C. F. BARNARD. STAMPING DENTAL-PLATES. I 110185,52; Patented Jan. zs,1's77.

Rc; RBARNARD." STAMPING DENTAL' PLATES. a N 186r5zz Patented Jan. 23, 187,1.

UNITED STATES thereof', reference being nying drawings, making a part ofthis speciti- PATENT OFFICE.

` CHARLES F. BARNARD, or vIofroRIA, BRITISH COLUMBIA.

IMPROVEMENT |`N STAMPING DEN-TAL PLATES.

` Specification forming part of Letters Patent No.` l 86,522, dated January 23, 1877; application filed v i August s, 1876.

'- talPlates; and do hereby declare thatthe following is a full, clear, and exact description had to the accompacation, in whic Figure l is a perspective view of my apparatus as arranged for storage. Fig. 2 is a like view of thepress and molding-fiask separated from each other. Fig. 3 is a perspective view of the mechanism employed for melting the soft metal used for forming the die-blocks. Fig; 4 is a perspective view of the lower end of the screw, having attached thereto the device for holding a plaster cast. Fig. 5 is a like view of said screwend, showing a different arrangement of the cast perforator. Fig. `o is a like view of a pair of dieblocks, with a mouth-plate in position within the lower die. blank employed for producing said plate. Fig. 8 is a perspectiveview of a mouth-plate separated from the mold, and Fig. 9 is a vertical central section of my improved lpress and die-` blocks as arranged :for use.

Letters of like` name and kind refer to like parts in each of the figures.` y Thedesign of my invention is to lessen the labor and expense attendant upon the forma tion of mouth-plates, and to enable the same to be more quickly produced, and to have greater strength anda more perfect form; to which end it consists, principally,4 as animprovement in the` art of mechanical dentistry, in the method for producing mouth-plates,sub stantially as is hereinafter. specified. V[t consists, further, in the mechanism employed for forming the dies, substantially as and for the purpose hereinafter shown. lt consists, further, in the means employed `for melting the metal used for forming the dies,substantially as is hereinafter set forth. It consists, further, in the mechanism 'employed in forming the mouth-plates, substantially as and for the purpose hereinafter shown and described.

Heretofore it has been customary for dentists to form their month-plates by placing a Fig. 7 is a plan v iew of theplate of 'suitable metal between two dies, and,

sess many and marked disadvantages, among4 which are the time and hard labor required; the hardening of the plate under the repeated blows, which frequently cause the metal to become fractured, and require that it should be frequently annealed; and the imperfect manner in which said plates are caused to conform to the` shape of said dies, it being nearly or quite impossible to fit a plate perfectly to the mouth of a person by such means.

These' difficulties are sought to be obviated by the method and mechanism hereinafter described, and mechanical dentistry relieved of some of its most objectionable features.

As my method and mechanism are closely related, I will describe them at one and the same time.

In the annexed drawings, A represents the base, and B a n-shaped yoke, which form'the frame of my press.` Said base has preferably a length of about ten inchesand a breadth of about seven inches at its center, while said yoke has inside a height of live inches and about the saine breadth. lu and through the upper central portion of the yoke B is pro vided a vertical threaded opening, b, that receives and contains a correspondingly-thread-V ed screw, C, which screw is provided at its upper end with an eye, o, for the reception of a cross-bar, D. The lower end of the screw 0 is pointed or rounded, and tits into a correspondinglyshaped socket, e, that is formed within the upper central portion of a platen, E, `which platen is preferably made round in plan view.

Fitted loosely between the vertical portions of the yoke 'B is a flask, F, which has nearly equal dimensions in each direction in Vplan View, is square at one end and semicircular atA its opposite end, and has a depth inside of about one inch. A stud, a,secured upon, and projecting vertically upward from, the axial center of the base A, ts into a corresponding recess within the bottom of the liask F, and insures the relative horizontal position of the latter. A block, G, having a length just equal to the transverse dimensions of the interior ofthe flask F, and a height equal to the depth of the same, is fitted therein and capable of being moved forward or back, so as to lessen or increase the space between its front side and the rounded end of said flask. The rear side of said block or dam is vertical, so as to permit it to be placed against the rear wall of said flask, while its front sideis inclined, as shown, for the purpose of givingrincreased breadth of base without lessening the area of the space inclosed-at its upper side.

The flask described is employed for producing the metal mold upon or within which the mouth-plate is to be formed, as is hereinafter described.

For the purpose of melting the fusible alloy used for forming the metal mold, I employ a vessel, H, constructed from sheet metal in substantially the same form as the llask F, but having considerably more depth, which Vvessel is supported upon two sheet-metal legs,

I and I, that are secured to opposite sides, and have such breadth as to afford firm bearings for said vessel. At its-front rounded end the vessel Hl is provided with a lip, h, from which the molten metal is more readily poured, while at its rear side is a horizontal socket, K, that receives the correspondinglyshaped end of a bar, L, which bar furnishes a handle for raising and tilting said vessel. A second square socket, K', is secured vertically upon one side, near the rear end of said vessel, in which said bar maybe used, if desired.

Thelamp lVI, for furnishing heat to the melting-vessel H, is made to correspond exteriorly to, and to ll the interior of, the lia-sk F in front of the dam G, for convenience of storage, and is provided with a flat wick, m, that is raised by a Wick-wheel shaft, m', of usual construction. A screwcap, N, tted to and inclosing the lower end of the screw C, and provided withinv its lower end with a pointed stud, a, that has its upper threaded end contained within a correspondingly threaded opening, n', which is provided in said cap, completes my mechanism, the operation ot' which is as follows:

If desired, the cap N may be omitted, and the stud n fitted into a threaded opening in the lower end of the screw C.

y The plaster cast of the mouth is placed upon the stud a in such position as to bring the frmer centrally over the flask F, after which said cast is lowered, by means of the screw C,

l until its molded lower surface is below the upper edge of said flask. The dam G is moved forward to or near the rear end of said cast, and the molten metal is then poured from the vessel H into said flask, and allowed to cool.

The female die O having thus been prepared, the male dieP is formed in the usual manner, after which the former is placed in position within the ask. A blank plate, Q, is placed over the impression o. Said male die P is placed upon the latter, and the platen E then vplaced upon the upper side of said die P, when, by means of the pressure of the screw Og the latter is forced downward, and said plate-blank is caused to conform perfectly to the impression o. The operation of direct and constant pressure upon the plate A imparts to the latter a slight degree of temper, but doesnot crack said plate, or render it brittle and liable to crack, as in case of plates that are formednby repeated blows of a hammer upon the back of the male die.

This method of forming the plates is simple, comparatively noiseless, and relieves mechanical dentistry of one of its most objectionable and laborious features.

When not in use, the apparatus is packed together, as shown in Fig. l, its lamp being placed in the flask, the melting-Vessel placed astride of the latter, with the platen and screwcap contained within its interior.

A socket, K, corresponding to the dimensions of the screw-lever D, is provided upon the rear side of the melting-vessel H, for the reception of said lever when not in use.

The blank Q has such size and -shape that, whenmolded into form, but slight trimming of its edges will be required to adapt it to use.

Having thus fully set forth the nature and merits of my invention, what I claim as new l. As an improvement in the art of mechanical dentistry, the method 'of forming metallic dental mouthplates, which consists in shaping the same between dies by constantly-increasing pressure, in contradistinction to percussiveforce, for the purpose specified.

2. The screw-press, platen, ask, dam, and cast perforator or point, constructed and combined to operate in the manner and for the purposesubstantially as shown.

3. The melting -vessel- H, h, I, and I, lamp M, and operating lever or bar L, combined with each other in the manner and for the purpose substantially as set forth.

4. The combination of the dies, screw-press, v

platen, and ask, substantially as and for the purpose shown and described.

In testimony that I claim the foregoing I have hereunto set my hand this 22d day of April, 1876.

OHAS. F. BARNARD. Witnesses:

A. RIOKMAN, A. OFNER. 

